linux-kernel - [PATCH 3/3] habanalabs: add validity check for event ID received from F/W

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Date:   Thu, 22 Jul 2021 14:16:43 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ofir Bitton <obitton@...ana.ai>
Subject: [PATCH 3/3] habanalabs: add validity check for event ID received from F/W

From: Ofir Bitton <obitton@...ana.ai>

Currently there is no validity check for event ID received from F/W,
Thus exposing driver to memory overrun.

Signed-off-by: Ofir Bitton <obitton@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/gaudi/gaudi.c | 6 ++++++
 drivers/misc/habanalabs/goya/goya.c   | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index 0cb21440b5ff..655278e98618 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi.c
@@ -7962,6 +7962,12 @@ static void gaudi_handle_eqe(struct hl_device *hdev,
 	u8 cause;
 	int rc;
 
+	if (event_type >= GAUDI_EVENT_SIZE) {
+		dev_err(hdev->dev, "Event type %u exceeds maximum of %u",
+				event_type, GAUDI_EVENT_SIZE - 1);
+		return;
+	}
+
 	gaudi->events_stat[event_type]++;
 	gaudi->events_stat_aggregate[event_type]++;
 
diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
index 9d66bdda8789..d54c700c31cd 100644
--- a/drivers/misc/habanalabs/goya/goya.c
+++ b/drivers/misc/habanalabs/goya/goya.c
@@ -4805,6 +4805,12 @@ void goya_handle_eqe(struct hl_device *hdev, struct hl_eq_entry *eq_entry)
 				>> EQ_CTL_EVENT_TYPE_SHIFT);
 	struct goya_device *goya = hdev->asic_specific;
 
+	if (event_type >= GOYA_ASYNC_EVENT_ID_SIZE) {
+		dev_err(hdev->dev, "Event type %u exceeds maximum of %u",
+				event_type, GOYA_ASYNC_EVENT_ID_SIZE - 1);
+		return;
+	}
+
 	goya->events_stat[event_type]++;
 	goya->events_stat_aggregate[event_type]++;
 
-- 
2.25.1